OBHE can provide the production plant of polybutylene terephthalate (PBT) which the technology of direct esterification of pure terephthalic acid (PTA) and 1,4-butanediol (BDO) and continuous polycondensation are adopted. This distinctive PBT production technology is formed based on the absorption of foreign advanced technology and combined with our own polyester production technology and experiences, which has the unique features in advanced process, reliable equipments, low investment cost, low raw materials and energy consumption, high market competitiveness. The main process adopting the three reactors flow and the production flow is shorted. It also has special THF recovery technology which can realize 99.99% purity of recovery THF.

OBHE can provide the production plant of polytrimethylene terephthalate (PTT) which the technology of direct esterification of pure terephthalic acid (PTA) and 1,3-propanediol (PDO) and continuous polycondensation are adopted. This distinctive PTT production technology with three reactors flow is formed based on the absorption of foreign advanced technology and combined with our own polyester production technology and experiences, which has the unique features in advanced process, reliable equipments, low investment cost, low raw materials and energy consumption, high market competitiveness.

Process features:

■ Advanced three-kettle process, short residence time, mild reaction, stable product quality.

■ New type process tower, high separation efficiency, easy to control.

■ The reactor is specially designed to ensure the product index: B value ≤4, L value ≥90, viscosity between 0.8-1.2.The optimized THF recovery system ensures the purity of THF up to 99.98%.